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Abstract A new method for measuring the redshifts of galaxy clusters based on photometric SDSSIII data is presented. Highly accurate photo-z measurements for red-sequence galaxies using machine learning techniques on a training sample of luminous red BOSS LOWZ galaxies allow the redshifts of...
Abstract The PPMXL and UCAC4 catalogs are compared by representing the differences between the positions and proper motions of stars as decompositions into a set of orthogonal vector harmonics with allowancemade for themagnitude equation. A list of 41 316 676 common stars has been compiled using...
Abstract The results of a comprehensive study of the Galactic open cluster NGC 6800 are presented. The positions of stars to a limiting magnitude B ≃ 16 m. 5 in an 80’ × 80’ field centered at the cluster were measured on eight plates from the Pulkovo normal astrograph with a maximum epoch...
Abstract The possible constraints on the equation of state for superdense baryonic matter to which an accurate measurement of the mass for the binary radio pulsar PSR J0348-0432 (M/M⊙ = 2.01 ± 0.04) leads have been determined. We use the bag model for strange quark matter (SQM), where the...
Abstract Three high-resolution spectra have been taken at different times with the 6-m SAO RAS telescope (LYNX and PFES spectrographs) for three Cepheids exhibiting high positive period increments: the small-amplitude (DCEPS) SZ Cas and BY Cas and the classical (DCEP) RU Sct. SZ Cas and RU Sct...
Abstract Long-term variations of solar activity, including the Grand minima, are believed to result from temporal variations of dynamo parameters. The simplest approximation of dynamo waves is applied to show that cyclic variations of the parameters can lead to an exponential growth or decay of...
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